diff --git a/src/main/java/cn/citycraft/Yum/api/YumApi.java b/src/main/java/cn/citycraft/Yum/api/YumApi.java
index ac0bbda..4dfdf46 100644
--- a/src/main/java/cn/citycraft/Yum/api/YumApi.java
+++ b/src/main/java/cn/citycraft/Yum/api/YumApi.java
@@ -3,6 +3,13 @@
  */
 package cn.citycraft.Yum.api;
 
+import java.net.URL;
+
+import org.bukkit.command.CommandSender;
+import org.bukkit.plugin.Plugin;
+
+import cn.citycraft.Yum.manager.YumManager;
+
 /**
  * Yum仓库插件API
  *
@@ -10,5 +17,7 @@ package cn.citycraft.Yum.api;
  * @since 2015年8月22日下午4:43:41
  */
 public class YumApi {
-
+	public static boolean update(final CommandSender sender, final Plugin plugin, final URL url, final String version) {
+		return YumManager.update(sender, plugin, url, version);
+	}
 }
diff --git a/src/main/java/cn/citycraft/Yum/manager/DownloadManager.java b/src/main/java/cn/citycraft/Yum/manager/DownloadManager.java
index a54f6d9..116f6ab 100644
--- a/src/main/java/cn/citycraft/Yum/manager/DownloadManager.java
+++ b/src/main/java/cn/citycraft/Yum/manager/DownloadManager.java
@@ -128,7 +128,7 @@ public class DownloadManager {
 				fout.write(data, 0, count);
 				final int percent = (int) (downloaded * 100L / fileLength);
 				if (percent % 10 == 0) {
-					if (fileLength < 102400 || System.currentTimeMillis() - time > 1000) {
+					if (System.currentTimeMillis() - time > 500) {
 						sender.sendMessage(String.format("§6已下载: §a" + getPer(percent / 10) + " %s%%", percent));
 						time = System.currentTimeMillis();
 					}
diff --git a/src/main/java/cn/citycraft/Yum/manager/RepositoryManager.java b/src/main/java/cn/citycraft/Yum/manager/RepositoryManager.java
index 53a97d4..6aed95d 100644
--- a/src/main/java/cn/citycraft/Yum/manager/RepositoryManager.java
+++ b/src/main/java/cn/citycraft/Yum/manager/RepositoryManager.java
@@ -141,11 +141,11 @@ public class RepositoryManager {
 		final String repocache = config.getString("repocache");
 		final String plugincache = config.getString("plugincache");
 		try {
-			if (!repocache.isEmpty()) {
+			if (repocache != null && !repocache.isEmpty()) {
 				repos = gson.fromJson(repocache, new TypeToken<List<String>>() {
 				}.getType());
 			}
-			if (!plugincache.isEmpty()) {
+			if (plugincache != null && !plugincache.isEmpty()) {
 				plugins = gson.fromJson(plugincache, new TypeToken<HashMap<String, PluginInfo>>() {
 				}.getType());
 			}
diff --git a/src/main/java/cn/citycraft/Yum/manager/YumManager.java b/src/main/java/cn/citycraft/Yum/manager/YumManager.java
index daf290a..a545d2c 100644
--- a/src/main/java/cn/citycraft/Yum/manager/YumManager.java
+++ b/src/main/java/cn/citycraft/Yum/manager/YumManager.java
@@ -1,6 +1,7 @@
 package cn.citycraft.Yum.manager;
 
 import java.io.File;
+import java.net.URL;
 
 import org.bukkit.Bukkit;
 import org.bukkit.command.CommandSender;
@@ -56,4 +57,12 @@ public class YumManager {
 		}
 		return false;
 	}
+
+	public static boolean update(final CommandSender sender, final Plugin plugin, final URL url, final String version) {
+		if (download.run(sender, url, new File(Bukkit.getUpdateFolderFile(), plugman.getPluginFile(plugin).getName()))) {
+			sender.sendMessage("§6更新: §a已下载插件 " + plugin.getName() + " 到update文件夹 重启后自动更新(或使用upgrade直接升级)!");
+			return true;
+		}
+		return false;
+	}
 }